Broken boiler?????.....?

When my meter runs out of gas, i have to relight my boiler when i top it up. I went to do this earlier but the switch i use to turn it to relight wouldn't move so i think it's stuck. I've had no heating or hot water all day, I have a bad cold and a 5 month old baby so not the best of times for this to happen. Anyone have the same kind of boiler that can help or anyone have any advice in general? Thanks x